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6947 Andrewdavis (1981 ET8)
Classification: Main-belt Asteroid          SPK-ID: 2006947
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06226845454172544 5.6736e-08  
a 2.39824500155851 1.3223e-08 AU
q 2.248909991699044 1.347e-07 AU
i 3.878751509998626 6.0767e-06 deg
node 213.2067172455093 7.8355e-05 deg
peri 352.0791921912432 8.9492e-05 deg
M 2.826041262806742 4.4497e-05 deg
tp 2456989.850854846615
(2014-Nov-28.35085485)
0.00016767 JED
period 1356.559193127641
3.71
1.1219e-05
3.072e-08
d
yr
n .2653772882331769 2.1947e-09 deg/d
Q 2.547580011417976 1.4046e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      993  
   data-arc span      21978 days (60.17 yr)  
   first obs. used      1955-04-20  
   last obs. used      2015-06-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55313  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 11:55:37  

Additional Information
 Earth MOID = 1.2458 AU 
 T_jup = 3.522 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.3 mag n/a MPO250277  

6947 Andrewdavis           Discovered 1981 Mar. 1 by S. J. Bus at Siding Spring in the course of the U.K. Schmidt-Caltech Asteroid Survey.
Andrew M. Davis (b. 1950) is a meteoriticist at the University of Chicago. His work on the trace elemental and isotopic composition of meteorites has addressed fundamental questions about timescales and processes in the solar nebula.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060809/MPCPages.arcLast Updated: 2007-08-08

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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